Is there a faster way to select objects?
In Blender, selection and deselection operations are included in the undo stack. This means you can use Ctrl+Z to undo any time you incorrectly select or deselect something.

The developers tie so many operations to keyboard shortcuts because it's a lot more time efficient for users that are familiar with them. Most operations can still be accessed through menus, and nearly all of them can be accessed by searching with F3 (or the spacebar in older versions.) You can see (and change) all keyboard shortcuts by going to 'Edit > Preferences' and clicking 'Keymap' on the left side.